Available online at www.jrors.ir Journal Of Radar and Optic Remote Sensing JRORS 2 (2018) 79–93 Investigating the role of duality in geomorphology using radar data in Bahadoran plain of Yazd Hamed Piri a*, Abolqasem Amir Ahmadi b , Hamed Adabc a Member of young researcher club, Islamic Azad university, Safadasht Branch, Tehran,Iran b Associate Professor of Faculty of Geography, Hakim University of Sabzevar c Assistant Professor of Faculty of Geography, Hakim Sabzevari University Received 23 May 2018; revised 22 September 2018; accepted 22 October 2018 Abstract Many varied attitudes exist about how the changes occur in the land-surface from the time of William Davis’s research to the latest researchers in the history of geomorphologic philosophy and many different terms are used by scientists in order to observe their ideas related to geomorphic phenomena. The phenomenon of duality has been seen less in the geomorphology field. There exist some contradictory phenomena in nature, but further investigation can show their correlation clearly. Durability can be considered as a better dynamic entropy. In this research, radar interferometry technique has been used in Yazd-Bahadoran area and the amount of subsidence and uplifting has been investigated Through field and library studies and the results have been compared with the other researchers' studies, which is a new concept in the literature of geomorphology under geo-duality. The study results indicate that the main reason for the subsidence was not to cut down the level of groundwater, and in this regard the tectonic movements play a significant role. Also, the study shows a significant relationship between subsidence in the Bahadoran plain and the collapse in adjacent heights in terms of duality or dichotomy. Keywords: Subsidence, Uplifting, Duality, Geomorphology, Radar images * Corresponding author. Tel: +98-9124598597. E-mail address: [email protected]. 80 Hamed Piri , Abolqasem Amir Ahmadi & Amed Adab / Journal Of Radar and Optic Remote Sensing 2 (2018) 79–93 1. Introduction Land subsidence due to groundwater extraction has been known as a major problem with environmental impacts in many areas. The effects of subsidence due to inappropriate groundwater abstraction, geological factors and groundwater are also very effective. The porosity of the aggregates of the soil layers, density, type, kind and composition of the layers, the pumping method, the geological structure of the area, the hydraulic conductivity of the layers, rainfall and temperature, are the factors affecting the subsidence of the land (Akbari et al., 2009). Excessive groundwater abstraction leads to a drop in groundwater level and a decrease in fluid pressure resulting in an increase in particle pressure, which leads to a density and a phenomenon of subsidence of the earth. In Iran, almost a thirty-year history has been related to land subsidence, If this phenomenon occurred only in some of the provinces, such as Kerman and Yazd. Also the present field of Isfahan, Khorasan, Tehran, Tabriz, etc., are subsiding and this problem increasingly occurs in Governments which are more prominent (Ghani Ardekani and Maleki, 2016). Among all the downsides which occur in Iran, the extraction of underground water is the most important factor for land subsidence. The Iranian plateau is located at the site of Saudi Arabia, India and Eurasia. The intersection of these folios has caused alteration to the shell of the Iran plateau which is surrounded by wrinkles and mountains, such as the Zagros in the west and southwest, the Alborz and Kopeh Dagh in the north and northwest, and the mountains of east and south east (Makran) which have a high seismicity. With the advent of techno-movement that has existed for many years in different parts of the terrestrial zone, the uplifting or rise can be seen (Adib et al., 2016) at the end of the altitudes more often, and sometimes elsewhere in Iran. To identify the fault patterns in the Zagros; three geological sections are depicted to estimate the elevation during the fault of Zagros. Zagros faults indicate the general state of tectonic movements in the course of a natural fault (Monserrat et al., 2014). In this region, fault patterns and lithogenic curves indicate a reversal of tectonic movements during the old faults. Considering the geological sections and stratigraphic sections and the age of the Zagros fault, the minimum vertical fault velocity from the beginning of sedimentation of Bakhtiari formation in Zagros is 2.05. 01 mm per year (Hakimi, 2015). When the lithosphere is compressed and moves to occupy less space, the stones are crushed, bent, eaten, or moved upwards. Conflict with horizontal structure has been due to the ground forces and by horizontal and vertical curvature and folding forces which can be and seen in different forms of anticline and syncline. Broken bubbles or hot spots: These low-density forms move upwards, sometimes up to 3,000 kilometers. The active processes in the cones influence their evolution and therefore can consider the movements of the faults and the displacement of the earth's surface. Investigating Maroon basin characteristics in the southwest of the country regarding tectonic and geologically new changes indicate that the uplift in this region is very active and tectonic has a great influence on settlements and land forms (Maqsoudi et al., 2018). There exist both different and separate phenomena interacting upon each other in nature. In many cases the association of these phenomena is expressed as solidarity and one can also measure these relationships through mathematical methods. Among them, one can find a pair of phenomena Hamed Piri , Abolqasem Amir Ahmadi & Amed Adab / Journal Of Radar and Optic Remote Sensing 2 (2018) 79–93 81 having some connections to each other (Pourkhosrowani, 2015) but these relationships cannot be suggested as a matter of solidarity, and their connection in terms of feature between them has been raised as duality. Duality describes a connection with symmetry, operating in an opposite direction and the expression of a certain proportion can be considered as one of its characteristics. Each scientific theory presented by the scholars of world is characterized in terms and metaphors that follow the structure and patterns of the technique. Therefore, the structure and technical patterns are based on concepts, basic patterns, literature, and theories. In different sciences, the processing and conversion of the basic words of this science is required. Here it is possible to refer specifically to the duality. Radar interferometry (InSAR) has also been widely considered in recent years as one of the non- geodetic methods with regard to the advantages of other methods (Cigna et al., 2012). This method among ground and space methods is considered as the most efficient method for measuring ground changes with high precision and spatial resolution. Its advantages are of high precision (Monserrat et al., 2014) wide coverage, high spatial resolution, and the lack of need for field work, cost- effectiveness, and the ability to access information in any weather conditions. In Iran, in the past few years, this method has been used to monitor earth's deformations. But to date, the ability of the radar interferometry technique in studying earth's deformations in comparison with the observations of the global positioning system has not thoroughly and extensively been evaluated. One of the reasons is the limited number of permanent GPS stations in the geodynamic network of Iran. The study of the ability and precision of this method seems necessary in measuring the displacement of the surface of the earth. The purpose of this study is to investigate the duality using the radar interferometry method in Bahadaran plain of Yazd. The research hypothesis is that the correlation between subsidence and uplifting is significant in the study area - duality. Case Study: Central Plain of Iran-Bahadoran Yazd This area is in a geographical position of 54 degrees and 30 minutes to 55 degrees' east longitude and 31 degrees to 31 degrees 30 minutes the north latitude which surround the southern quarter of Yazd (Figure 1). Yazd and Mehriz cities are in the northwest. The pomegranate sheriffdom is part of the southeast. The climate of this area whose name is derived from Bahadoran village, is like a desert climate with high temperatures, low humidity and high vaporization. Its maximum temperature reaches to +48°C and reaches a minimum temperature of -15°C and its precipitation reaches to about 60-70 mm per year. This area does not have a river and agricultural activities are carried out through the aqueducts. The morphology of roughness is divided into three groups: slopes, plains and heights. The stone units of this area are mostly northwest-southeast which its northern side is towards Bahadoran and the southern and central parts of Pariya basin. These basins are located in hollow, therefore it is the location of waters flow in which a lot of salt remains due to high evaporation a lot of salt remains (Figure 1). 82 Hamed Piri , Abolqasem Amir Ahmadi & Amed Adab / Journal Of Radar and Optic Remote Sensing 2 (2018) 79–93 The second unit produces quaternary acquaillite of alluvial tributaries that at the time of precipitation makes the existing streams. The high and rugged mountain ranges are the third unit formed by the carbonate formation of Taft. The highest point of Kermanshah Mountain is at 2890 meters and the lowest elevation is Bahadaran plain with a height of 1427 meters. Geologically, Paleozoic rocks are seen in a few hills scattered in the Bahadaran plate and Jamal formation. The most extensive expansion of these rocks is from the northwest to the southeast, called Taft formation. Figure 1. The studied area (Bahadoran plain of Yazd) 2. Materials and methods Radar interferometer technique is one of the most powerful tools for monitoring the subsidence phenomenon (Buck, 2011).